Analog Devices has announced the new LTC5597 IC, a high accuracy RMS power detector that provides a very wide RF input bandwidth, from 100 MHz up to 70 GHz. This makes the device suitable for a wide range of RF and microwave applications, such as point-to-point microwave links, instrumentation and power control applications.
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| 100 MHz to 70 GHz RMS Power Detector. |
The DC output voltage of the detector is an accurate representation of the average signal power applied to the RF input. The response is linear-in-dB with 28.5 mV/dB logarithmic slope over a 35 dB dynamic range with typically better than ±1 dB accuracy. The detector is particularly suited for measurement of waveforms with crest factor (CF) as high as 12 dB, and waveforms that exhibit a significant variation of the crest factor during measurement.
To achieve higher accuracy and lower output ripple, the averaging bandwidth can be externally adjusted by a capacitor connected between the FLTR and OUT pins.
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| Output Voltage vs Frequency. |
The enable interface switches the device between active measurement mode and a low power shutdown mode.
Features
- Ultra Wide Matched Input Frequency Range: 100 MHz to 70 GHz
- 35 dB Linear Dynamic Range (< ±1 dB Error)
- 28.5 mV/dB Logarithmic Slope
- ±2 dB Flat Response from 100 MHz to 60 GHz
- Accurate RMS Power Measurement of High Crest Factors (Up to 12 dB) Modulated Waveforms
- Low Power Shutdown Mode
- Low Supply Current: 33 mA at 3.3 V (Typical)
- Small 2 mm × 2 mm Plastic DFN8 Package
- Operating Temperature Range with Guaranteed Log-Slope and Log-Intercept:
- I-Grade: −40 °C to 105 °C Rated
- H-Grade: −40 °C to 125 °C Rated
- ESD Rating:
- 2500 V HBM,
- 1500 V CDM
Applications
- Point-to-Point Microwave Links
- SATCOM
- Instrumentation and Measurement Equipment
- Military Radios
- 5G, LTE, WiFi, Wireless Networks
- RMS Power Measurement
- Receive and Transmit Gain Control
- RF PA Transmit Power Control
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| Demonstration Circuit 2932A – a High Accuracy RMS Power Detector Featuring the LTC5597 IC. |
